Not likely to find one with open sights however a nice Boyds laminate stock would be an easy after market upgrade to any factory 6.5 PRC
Are you leaning toward factory? Or thinking custom?
Your current rifle is a better option already. 6.5 PRC can’t match it at any sane hunting distance with the same bullet weights. My opinion anyway. You actually might be able to find a near new used wood/blued 7mm RM with open sights.
I’ve pretty much narrowed it down to the Howa 1500 or Winchester XPR.
Just have to find out the specs on the barrel contour.
Would it be a difficult job to have open sights installed afterwards?